API 653 Hop Tap for 8" nozzle
API 653 Hop Tap for 8" nozzle
(OP)
Dear Sir.
Does anyone coult tell me if, for a tank of dia x H = 27.625' (liquid hight 20.8'), we can performance a hop tap of 8" nozzle having a shell average meassured thickness of 0.208". I know that API 653 require a minimum thickness of 1/4" but the shell plate required by calculation, using A283C plates and E = 0.7, is 0.1472".
In case that we can not performance the hot tap procedure I would apprciate any alternative to place in the tank a 8" nozzles without empty the thank
Thank for your help
Does anyone coult tell me if, for a tank of dia x H = 27.625' (liquid hight 20.8'), we can performance a hop tap of 8" nozzle having a shell average meassured thickness of 0.208". I know that API 653 require a minimum thickness of 1/4" but the shell plate required by calculation, using A283C plates and E = 0.7, is 0.1472".
In case that we can not performance the hot tap procedure I would apprciate any alternative to place in the tank a 8" nozzles without empty the thank
Thank for your help
RE: API 653 Hop Tap for 8" nozzle
Possible options:
Don't comply with API 653
Hot tap two 6" nozzles and pipe them together
Hot tap a shell manway cover plate with an 8" nozzle, if the cover plate is 1/4" or more
RE: API 653 Hop Tap for 8" nozzle
No spare empty tank available ? ...... Discuss this with the plant manager and the process engineer, perhaps this could be a future enhancement.
Suggest that you consider the modified shell manway cover plate fix. You can have a replacement made in the shop and ready to swap out during a brief shutdown
MJCronin
Sr. Process Engineer
RE: API 653 Hop Tap for 8" nozzle
Check with your plant Material Engineer to see if it helps to add a butter weld layer on the pipe for the hot tap connection.